drm/amdgpu: add amdgpu_gmc_get_pde_for_bo helper v2

Helper to get the PDE for a PD/PT.

v2: improve documentation

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c

@@ -26,6 +26,38 @@
 
 #include "amdgpu.h"
 
+/**
+ * amdgpu_gmc_get_pde_for_bo - get the PDE for a BO
+ *
+ * @bo: the BO to get the PDE for
+ * @level: the level in the PD hirarchy
+ * @addr: resulting addr
+ * @flags: resulting flags
+ *
+ * Get the address and flags to be used for a PDE (Page Directory Entry).
+ */
+void amdgpu_gmc_get_pde_for_bo(struct amdgpu_bo *bo, int level,
+			       uint64_t *addr, uint64_t *flags)
+{
+	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+	struct ttm_dma_tt *ttm;
+
+	switch (bo->tbo.mem.mem_type) {
+	case TTM_PL_TT:
+		ttm = container_of(bo->tbo.ttm, struct ttm_dma_tt, ttm);
+		*addr = ttm->dma_address[0];
+		break;
+	case TTM_PL_VRAM:
+		*addr = amdgpu_bo_gpu_offset(bo);
+		break;
+	default:
+		*addr = 0;
+		break;
+	}
+	*flags = amdgpu_ttm_tt_pde_flags(bo->tbo.ttm, &bo->tbo.mem);
+	amdgpu_gmc_get_vm_pde(adev, level, addr, flags);
+}
+
 /**
  * amdgpu_gmc_pd_addr - return the address of the root directory
  *
@@ -35,13 +67,14 @@ uint64_t amdgpu_gmc_pd_addr(struct amdgpu_bo *bo)
 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 	uint64_t pd_addr;
 
-	pd_addr = amdgpu_bo_gpu_offset(bo);
 	/* TODO: move that into ASIC specific code */
 	if (adev->asic_type >= CHIP_VEGA10) {
 		uint64_t flags = AMDGPU_PTE_VALID;
 
-		amdgpu_gmc_get_vm_pde(adev, -1, &pd_addr, &flags);
+		amdgpu_gmc_get_pde_for_bo(bo, -1, &pd_addr, &flags);
 		pd_addr |= flags;
+	} else {
+		pd_addr = amdgpu_bo_gpu_offset(bo);
 	}
 	return pd_addr;
 }

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h

@@ -133,6 +133,8 @@ static inline bool amdgpu_gmc_vram_full_visible(struct amdgpu_gmc *gmc)
 	return (gmc->real_vram_size == gmc->visible_vram_size);
 }
 
+void amdgpu_gmc_get_pde_for_bo(struct amdgpu_bo *bo, int level,
+			       uint64_t *addr, uint64_t *flags);
 uint64_t amdgpu_gmc_pd_addr(struct amdgpu_bo *bo);
 
 #endif

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -1428,13 +1428,14 @@ bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
 }
 
 /**
- * amdgpu_ttm_tt_pte_flags - Compute PTE flags for ttm_tt object
+ * amdgpu_ttm_tt_pde_flags - Compute PDE flags for ttm_tt object
  *
  * @ttm: The ttm_tt object to compute the flags for
  * @mem: The memory registry backing this ttm_tt object
+ *
+ * Figure out the flags to use for a VM PDE (Page Directory Entry).
  */
-uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
-				 struct ttm_mem_reg *mem)
+uint64_t amdgpu_ttm_tt_pde_flags(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
 {
 	uint64_t flags = 0;
 
@@ -1448,6 +1449,22 @@ uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
 			flags |= AMDGPU_PTE_SNOOPED;
 	}
 
+	return flags;
+}
+
+/**
+ * amdgpu_ttm_tt_pte_flags - Compute PTE flags for ttm_tt object
+ *
+ * @ttm: The ttm_tt object to compute the flags for
+ * @mem: The memory registry backing this ttm_tt object
+
+ * Figure out the flags to use for a VM PTE (Page Table Entry).
+ */
+uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
+				 struct ttm_mem_reg *mem)
+{
+	uint64_t flags = amdgpu_ttm_tt_pde_flags(ttm, mem);
+
 	flags |= adev->gart.gart_pte_flags;
 	flags |= AMDGPU_PTE_READABLE;
 

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h

@@ -116,6 +116,7 @@ bool amdgpu_ttm_tt_userptr_invalidated(struct ttm_tt *ttm,
 				       int *last_invalidated);
 bool amdgpu_ttm_tt_userptr_needs_pages(struct ttm_tt *ttm);
 bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm);
+uint64_t amdgpu_ttm_tt_pde_flags(struct ttm_tt *ttm, struct ttm_mem_reg *mem);
 uint64_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
 				 struct ttm_mem_reg *mem);
 

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

@@ -1014,9 +1014,7 @@ static void amdgpu_vm_update_pde(struct amdgpu_pte_update_params *params,
 		pbo = pbo->parent;
 
 	level += params->adev->vm_manager.root_level;
-	pt = amdgpu_bo_gpu_offset(entry->base.bo);
-	flags = AMDGPU_PTE_VALID;
-	amdgpu_gmc_get_vm_pde(params->adev, level, &pt, &flags);
+	amdgpu_gmc_get_pde_for_bo(entry->base.bo, level, &pt, &flags);
 	pde = (entry - parent->entries) * 8;
 	if (bo->shadow)
 		params->func(params, bo->shadow, pde, pt, 1, 0, flags);